Grinding-machine.



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Application led December 9, 1908.

To all whom it may concern.'

Be it known that I, VV'IILLrAM Bitner, a citizen of the United States oic America, residing' at Clifton, in 'the countyT of Graham and Territory oi" Arizona, have invented new and useful linprovi'nne'nts in Grinding-hilachines, of which the following is a specification. This invention relates to grinding machines designed for the purpose of grinding' or smoothing' mill ring' dios, and one of the principal objects of the invention is to provide improved means Vfor holding` the grind- .ing slices to the head or holder.

In machines for grinding mill ring dies, as at present constructed, the grinding' shoe is secured to the head or holder' by means of bolts which pass entirely through the shoe and are provided with squared tapering' heads which lie YHush with the :tace ot the `grinding` shoe. In operation the heads oi these screws coming' in contact with the ring' die form a groove and prevent the smooth operation of the shoe and Olten ruin the die.

It is to overcome the defect referred to in machines vfor grinding' ring` dies that my invention is cesig'ned, means being' provided for holding the shoe to the head or holder which `will not pass through the shoe and will thus not interfere with the smooth and proper operation of the shoe upon the ring' die.

The objects and advantages above referred to may be attained by means of the construction illustrated in the accompanying drawing', in which,"

Figure I is a iront elevation ol" a grinding' head and shoe made in accordance with my invention. Fig. 2 is a vertical section talien through the same. 3 is a side elevation of the same.

Referring to the drawing', the designates the head or holder oi the grinding device, and 2 is the shaft 'fitted I 'ig'htlytherL `n and secured by any suitable means, as by sln'inliing' or by means oi binding' screws. Formed in the lower face of the head l are dovetailed recesses 3 extending' entirely across the face of the holder.

The grinding shoe 4 is provided with a curved bearing' face 5, and upon its upper side said shoe'is provided rfith dove-tailed tenons 6 made to exactly fit in the dovenumeral l Specification o1" Letters Patent.

Patented April 6, 1909.

Serial No. 466,676.

tailed grooves 3 of the head l. Threaded bolt holes 7 extend vertically through the shoulders at the opposite sides of the holder l, said bolt holes communicating with the dovetailed recesses 3, and iitted into these bolt holes are threaded bolts 8, said bolts having' projecting studs 9 their ends, said studs being smooth and rounded upon their outer ends. Sockets l() are 'formed in the dovetailed tenons in which the studs 9 arol fitted to prevent the sliding movement of the shoe relatively to the holder. The bolts 8 are each provided rfith a square or polygonal head l by means of which said bolts may be turned upon application of a Wrench. A lock nut l2 is iittcd to the shank of the bolt 7 to limit the insertion of the bolt. In some of the grinding' mills the grinding shoe is ofv somewhat dilierent contour from the one herein illustrated and described, and hence a shoe having a beveled face may ie substituted for the one described Without departing from the spirit and scope of my invention as dei'ined by the claim.

The operation of my invention may be briei'l y described as follows: Whenever it is desired to secure the shoe l to the head l, the bolts 8 are 'withdrann suliiciently to remove the studs 9 from the dovetailed grooves The shoe l is then slipped into place and when properly centered, the bolts 8 are turned until the studs 9 are inserted. in the soclrets IC; of o dovetails o. YWhenever it is desired to reverse the shoe 4, this may be done by turning the shoe end for end, the dovetails 'hitting in the grooves 3, as before. In the usual construction ol grinding heads of this character', 'the bolts `which pass entirely through the shoe are constantly Worn ay, thus making' it necessary to have a large number of these bolts on hand. By means of my construction. one pair of bolts may last a longr time and 'a `ll do very much better ii'orlr, providi e' a smooth abrading surface to the shoe ani' permitting the same to Je readily reversed and quickly secured in place.

I claim :d

In a device for grinding mill rino' dies, a head or holder provided v'fith dovetailed grooves, a shoe provided with dovetailed tenons to iit said grooves, threaded bolts extending through the head and communicating with the dovetztiled grooves, said bolts i In testimony whereof I aflix my signature l having projecting' studs thereon to fit l l i in presence of two Witnesses.

WILLIAM BERRY Witnesses GEO. T. GAINES, C. C. DAWBER.

5 sockets in the doveteilecl tenons of the shoe,

and look nuts on seid bolts to limit the pro- I jection of the studs. 

